(slang, figuratively) Something that moves fast, especially a fast train.
Meetings of the model train club always begin with the song "Wabash Cannonball".
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(diving) The act of jumping (typically into a swimming pool) with the legs bent and the arms wrapped around the knees to create a large splash, mimicking the flight and shape of a cannonball.
The cannonball could be called the S.U.V. of the pool — oversized, brash, hormonally hardwired.
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(tennis) A served ball that travels with great speed and describes little or no arc in flight.
The New Yorker, 30 August 2004, p.40
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